Shamrok

Someone please help! 2008 Ford Edge Limted I have had 3 different alternators put in within the past year, all brand new along with a new battery. Since the 1st replacement, it randomly surges. Hopefully you can see what I am talking about in this video. Randomly, the lights will go bright then back to normal. Its fast and there is no pattern to it. When I have it tested, everything comes back perfect. I am at a loss!! Someone, anyone please point me in a direction. 20260126_203625_1.mp4

Bare with me, this is my fist "big" job by myself. The other night I had a coil 5 misfire. Changed the coil and plug and it was fine. The next morning driving to work another coil went, this time it said 6. I changed the coil and plug. Now the reader is saying "ignition coil F" I talked to a mechanic and he says it's possible the Bosch plugs are the issue. Any insight would be helpful! I can't get another car until tomorrow but I do plan on getting Motorcraft plugs and trying them.